CN106524896A - Online transformer winding deformation monitoring method based on circuit impedance method - Google Patents
Online transformer winding deformation monitoring method based on circuit impedance method Download PDFInfo
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- CN106524896A CN106524896A CN201611068279.2A CN201611068279A CN106524896A CN 106524896 A CN106524896 A CN 106524896A CN 201611068279 A CN201611068279 A CN 201611068279A CN 106524896 A CN106524896 A CN 106524896A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
- G01B7/18—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge using change in resistance
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Abstract
The invention discloses an online transformer winding deformation monitoring method based on a circuit impedance method and relates to a method used for monitoring transformer winding deformation conditions online. The method comprises steps that a circuit impedance value of a primary winding and a circuit impedance value of a secondary winding of a transformer in online operation are calculated by a micro processor according to an acquired first voltage, an acquired first current, an acquired second voltage and an acquired second current, and a mathematics model for calculating circuit impedance; the circuit impedance value of the primary winding acquired through calculation is compared by a worker with a circuit impedance value of a standard primary winding, the circuit impedance value of the secondary winding acquired through calculation is compared by the worker with a circuit impedance value of a standard secondary winding, and the transformer winding deformation conditions can be determined online in real time. The method is advantaged in that a circuit impedance method is employed for measurement, the principle is simple, and the method is convenient to realize.
Description
Technical field
The present invention relates to a kind of method for monitoring deformation of transformer winding situation on-line, specifically one kind is based on
The deformation of transformer winding on-line monitoring method of circuit impedance method.
Background technology
Power transformer is one of important electrical equipment in power system, and voltage transformation, electricity are undertaken in power system
Can distribution and the substantial responsibility for shifting.The expensive and complex structure of power transformer, its health status are even more whole electricity
The premise of net safe operation.It is once there is accident in large-scale power transformer running, it is likely that cause power outage, right
Resident living and plant produced affect huge, while the maintenance time of transformer is typically more than half a year, it is costly, therefore
Need to ensure the safe operation of transformer as possible.Therefore, in order to ensure the maximum uptime of transformer, it is necessary to transformation
The parameter of device, state carry out continuing and intensive monitoring, to assess the operating condition and working condition of transformer.Wherein, transformation
The monitoring of device winding deformation is a wherein critically important part.
Each parameter of transformer equivalent circuit can react substantial amounts of transformer state information.The change of circuit reactance can be with
The deformation of reaction Transformer Winding, distinguishes internal fault and external fault；And the change of coil-block of transformer can be used
To monitor winding temperature, circuit conditions of inside transformer coil etc..
The parameter of transformer equivalent circuit can be measured by circuit testing and no-load test, but this class method needs
Off-line test is carried out, transformer is disconnected from electrical network, the abnormal signal during transformer station high-voltage side bus can not be detected.Thus
The method of this class offline inspection can not react Transformer Winding running status in real time.
In the on-line monitoring of deformation of transformer winding, most commonly frequency response method, but due to different model, difference
The factors such as the mode of connection all have a certain impact to the frequency response curve of transformer, and majority all leans on the experience of testing staff to carry out
Judge, lack reliable winding deformation judgment basis.
The content of the invention
The invention aims to overcome the weak point of background technology, and provide a kind of change based on circuit impedance method
Deformation of transformer winding on-line monitoring method.
To achieve these goals, the technical scheme is that：Existed based on the deformation of transformer winding of circuit impedance method
Line monitoring method, it is characterised in that：It comprises the steps,
Step 1：Install a first voltage transformer and first current transformer on the former limit circuit of transformer additional,
Install a second voltage transformer and second current transformer on the secondary circuit of transformer additional；
Step 2：It is first electric that first voltage that first voltage transformer is detected, the first current transformer are detected
The second electric current that the second voltage and the second current transformer that stream, second voltage transformer are detected is detected passes to data and adopts
Collecting system, microprocessor are hindered according to the first voltage for collecting, the first electric current, second voltage, the second electric current, and counting circuit
Anti- Mathematical Modeling, calculate the resistance value of the primary side winding of the transformer of on-line operation, the inductance value of primary side winding, secondary around
The inductance value of the resistance value and vice-side winding of group；Wherein, the Mathematical Modeling of the counting circuit impedance is：A (t)=U1(t)-U12
(t)=KPT1U10(t)-nKPT2U20(t),
Wherein, C=AB-1, A (t), B (t) and C be matrix, and n is transformer voltage ratio, KPT1For first voltage transformer
No-load voltage ratio, KPT2For second voltage transformer no-load voltage ratio, there is N number of sampled point in each cycle T=0.02s, each time intervalR1For transformer any t primary side winding values of circuit resistances, L1 be transformer any t original
The circuit inductance of side winding；R12For transformer any t vice-side winding values of circuit resistances, L12 be transformer any
The t vice-side winding circuit inductances at moment；U10(t) for any t of first voltage transformer detect voltage, U20T () is
The voltage that second voltage transformer is detected in any t, I1T () is detected in any t for the first current transformer
Electric current, I12T () is the electric current that the second current transformer is detected in any t, I10(t+ Δ t) are the first Current Mutual Inductance
The electric current that device is detected in any t+ Δs t, I20(t+ Δ t) are detected in any t+ Δs t for the second current transformer
Electric current；Step 3：According to the inductance value of the inductance value and vice-side winding of the primary side winding calculated in step 2, change is calculated
The primary circuit impedance and secondary circuit impedance of depressor winding；Wherein, the primary circuit impedance X of Transformer Winding1=2 π fL1, become
The secondary circuit impedance X of depressor winding2=2 π fL12/n2, f=50Hz；Step 4：Four sampled points are chosen, by data acquisition
And analysis process system, respectively computer go out primary circuit resistance value and secondary circuit impedance of each sampled point in synchronization
Value, calculate four primary circuit resistance values mean value, using the mean value of calculated four primary circuit resistance values as
The real-time primary circuit resistance value of Transformer Winding, calculates the mean value of four secondary circuit resistance values, by calculated four
Real-time secondary circuit resistance value of the mean value of individual secondary circuit resistance value as Transformer Winding；Step 5：By in step 4
In real time primary circuit resistance value is contrasted with the primary circuit resistance value of standard, and by real-time secondary circuit resistance value and standard
Secondary circuit resistance value contrasted, judge whether Transformer Winding deforms.
The present invention can realize high pressure, the on-line measurement of the circuit impedance parameter of low pressure winding of transformer, so as to judge
Deformation of transformer winding situation, detection method are simple and reliable.
The present invention is measured using circuit impedance method, and principle is simple, and it is convenient to realize.Meanwhile, the present invention can be in not shadow
In the case of ringing transformer-supplied, survey calculation is carried out to the winding circuit resistance value of transformer, and high pressure can have been calculated respectively
The circuit impedance parameter of winding, low pressure winding, facilitates deciding on winding deformation specifically in high-pressure side or low-pressure side.And due to existing
The offline circuit impedance method for judging deformation of transformer winding having is more ripe, thus the method is by calculating transformer
Circuit reactance value, have the parameter comparison foundation for clearly judging winding deformation.
Description of the drawings
The T-shaped equivalent circuit of Fig. 1 transformers.
Fig. 2 transformer circuit reactance on-line measurement schematic diagrams.
Specific embodiment
Describe the performance of the present invention below in conjunction with the accompanying drawings in detail, but they do not constitute limitation of the invention, only
It is for example.Make advantages of the present invention more clear and easy to understand by explanation simultaneously.
Understand refering to accompanying drawing：Deformation of transformer winding on-line monitoring method based on circuit impedance method, it is characterised in that：It
Comprise the steps,
Step 1：Install a first voltage transformer and first current transformer on the former limit circuit of transformer additional,
Install a second voltage transformer and second current transformer on the secondary circuit of transformer additional；
Step 2：It is first electric that first voltage that first voltage transformer is detected, the first current transformer are detected
The second electric current that the second voltage and the second current transformer that stream, second voltage transformer are detected is detected passes to data and adopts
Collecting system, microprocessor are hindered according to the first voltage for collecting, the first electric current, second voltage, the second electric current, and counting circuit
Anti- Mathematical Modeling, calculate the resistance value of the primary side winding of the transformer of on-line operation, the inductance value of primary side winding, secondary around
The inductance value of the resistance value and vice-side winding of group；
Wherein, the Mathematical Modeling of the counting circuit impedance is：
A (t)=U1(t)-U12(t)=KPT1U10(t)-nKPT2U20(t),
Wherein, C=AB-1, A (t), B (t) and C be matrix, and n is transformer voltage ratio, KPT1For first voltage transformer
No-load voltage ratio, KPT2For second voltage transformer no-load voltage ratio, there is N number of sampled point in each cycle T=0.02s, each time interval
R1For transformer any t primary side winding values of circuit resistances, L1 be transformer any t former limit
The circuit inductance of winding；R12For transformer any t vice-side winding values of circuit resistances, L12 be transformer when any
The t vice-side winding circuit inductances at quarter；
U10(t) for any t of first voltage transformer detect voltage, U20T () exists for second voltage transformer
The voltage that arbitrarily t is detected, I1T () is the electric current that the first current transformer is detected in any t, I12T () is
The electric current that two current transformers are detected in any t, I10(t+ Δ t) are the first current transformer in any t+ Δs t
The electric current for detecting, I20(t+ Δ t) are the electric current that the second current transformer is detected in any t+ Δs t；
Step 3：According to the inductance value of the inductance value and vice-side winding of the primary side winding calculated in step 2, calculate
The primary circuit impedance and secondary circuit impedance of Transformer Winding；Wherein, the primary circuit impedance X1=2 π of Transformer Winding
FL1, the secondary circuit impedance X2=2 π fL12/n of Transformer Winding2, f=50Hz；
Step 4：Four sampled points are chosen, by data acquisition and analysis process system, computer goes out each sampling respectively
Primary circuit resistance value and secondary circuit resistance value of the point in synchronization, calculate the mean value of four primary circuit resistance values,
Using the mean value of calculated four primary circuit resistance values as the real-time primary circuit resistance value of Transformer Winding, calculate
The mean value of four secondary circuit resistance values, using the mean value of calculated four secondary circuit resistance values as transformer around
The real-time secondary circuit resistance value of group；
Step 5：Real-time primary circuit resistance value in step 4 and the primary circuit resistance value of standard are contrasted, and
Secondary circuit resistance value of the real-time secondary circuit resistance value with standard is contrasted, is judged whether Transformer Winding occurs to become
Shape.
During real work, Z1、R1And X1Respectively primary circuit impedance, former limit resistance and former limit reactance, Z2、R2And X2Respectively
For secondary circuit impedance, resistance, reactance, secondary circuit impedance, Z12、R12And X12Former limit is arrived in respectively resistance, reactance reduction
Value, Z0、R0And X0Respectively excitation impedance, resistance and reactance；
KPT1For the no-load voltage ratio of first voltage transformer, KPT2For second voltage transformer no-load voltage ratio, KCT1For the first Current Mutual Inductance
The no-load voltage ratio of device；KCT2For the no-load voltage ratio of the second current transformer；
For transformer primary side, the voltage that first voltage transformer is detected isWhat the first current transformer was detected
Electric current isFor transformer secondary, second voltage transformer detects the voltage of s and isSecond current transformer is detected
Electric current be
During real work, for any time t, had according to Kirchhoff's second law：
Hypothesis has N number of sampled point in each cycle T=0.02s, then each time interval
For any t and t+ Δ ts, voltage U that is measurable and conversing high-pressure side, low-pressure side1(t)、U12(t)
And electric current I1(t)、I1(t+Δt)、I12(t)、I12(t+Δt)。
Three matrixes are defined now：
A (t)=U1(t)-U12(t)；
Therefore can obtain:A (t)=B (t) C.
Calculated by the sampling at each moment, matrix A (t), matrix B (t) all can be calculated.It is now assumed that passing through
Four instance sample point (t1、t2、t3、t4) calculate corresponding matrix A (t), matrix B (t).Then have：A(t1)=B (t1)C；A
(t2)=B (t2)C；A(t3)=B (t3)C；A(t4)=B (t4)C。
It is now assumed that matrix：
Therefore A=BC can be obtained, as B is 4*4 rank matrixes, its inverse matrix can be sought, therefore transformer high-voltage winding, low pressure winding
Circuit impedance parameter：
C=AB-1
Analyze from more than, a corresponding Transformer Winding circuit impedance ginseng per 4 sample points, is being obtained
Number.The mean value of each circuit impedance for being calculated can be taken, as Transformer Winding in the parameter measured by each cycle
Real not time circuit impedance.
The transformer circuit resistance value for calculating acquisition is carried out with the circuit resistance value standard for judging deformation of transformer winding
Contrast, so as to the deformation of the judgement Transformer Winding of real-time online.
During real work, voltage transformer pt1No-load voltage ratio be KPT1, PT2No-load voltage ratio be KPT2, Current Transmit1No-load voltage ratio
For KCT1；CT2No-load voltage ratio be KCT2.For transformer primary side, voltage transformer pt1The voltage for detecting isCurrent transformer
CT1The electric current for detecting isFor transformer secondary, voltage transformer pt2The voltage for detecting isCurrent transformer
CT2The electric current for detecting isTherefore have
Therefore following four expression formula can be obtained：
With reference to the transformer circuit impedance expression derived in invention content, can obtain
A (t)=U1(t)-U12(t)=KPT1U10(t)-nKPT2U20(t)；
If voltage transformer pt1、PT2, Current Transmit1、CT2It is N in the sampled point of each cycle 0.02s, then
Matrix A (t), the value in the expression formula of B (t) are all known or measurable.Wherein transformer voltage ratio n, electricity
No-load voltage ratio K of pressure transformerPT1、KPT2, no-load voltage ratio K of current transformerCT1、KCT2It is known.U10(t)、U20(t)、I10(t)、I10(t
+Δt)、I20(t)、I20(t+ Δ t) are measurable by voltage transformer, current transformer.
By the value for obtaining 4 different instance sample points, matrix A, B are also known.So as to can be according to C=AB-1Try to achieve
The primary side winding circuitous resistance of Matrix C, as transformer, reactance R1、X1；Former limit is arrived in vice-side winding circuitous resistance, reactance reduction
Value R12、X12。
Vice-side winding circuitous resistance, reactance are can be calculated further
Analyze from more than, by voltage transformer, the measurement of current transformer, per 4 sample points, by number
According to collection and analysis process system, computer is obtained a corresponding Transformer Winding circuit impedance parameter.Can be at each
The mean value of each circuit impedance for being calculated in parameter measured by cycle, is taken, is hindered as the real not time circuit of Transformer Winding
It is anti-.
The Transformer Winding circuit reactance value that measurement is obtained is contrasted with the criterion of deformation of transformer winding, is sentenced
Whether disconnected Transformer Winding deforms.Such that it is able to monitor on-line to deformation of transformer winding situation in real time.
Other unaccounted parts belong to prior art.
Claims (1)
1. the deformation of transformer winding on-line monitoring method based on circuit impedance method, it is characterised in that：It comprises the steps,
Step 1：Install a first voltage transformer and first current transformer on the former limit circuit of transformer additional, becoming
Install a second voltage transformer and second current transformer on the secondary circuit of depressor additional；
Step 2：The first electric current that first voltage that first voltage transformer is detected, the first current transformer are detected,
The second electric current that the second voltage and the second current transformer that two voltage transformers are detected is detected passes to data acquisition system
System, microprocessor is according to the first voltage for collecting, the first electric current, second voltage, the second electric current, and counting circuit impedance
Mathematical Modeling, calculates the resistance value of the primary side winding of the transformer of on-line operation, the inductance value of primary side winding, vice-side winding
The inductance value of resistance value and vice-side winding；
Wherein, the Mathematical Modeling of the counting circuit impedance is：
A (t)=U1(t)-U12(t)=KPT1U10(t)-nKPT2U20(t),
Wherein, C=AB-1, A (t), B (t) and C be matrix, and n is transformer voltage ratio, KPT1For the no-load voltage ratio of first voltage transformer,
KPT2For second voltage transformer no-load voltage ratio, there is N number of sampled point in each cycle T=0.02s, each time interval
R1For transformer any t primary side winding values of circuit resistances, L1 be transformer any t primary side winding
Circuit inductance；R12For transformer any t vice-side winding values of circuit resistances, L12 be transformer t at any time
Vice-side winding circuit inductance；
U10(t) for any t of first voltage transformer detect voltage, U20T () is second voltage transformer in any t
The voltage that moment detects, I1T () is the electric current that the first current transformer is detected in any t, I12T () is the second electric current
The electric current that transformer is detected in any t, I10(t+ Δ t) are detected in any t+ Δs t for the first current transformer
Electric current, I20(t+ Δ t) are the electric current that the second current transformer is detected in any t+ Δs t；
Step 3：According to the inductance value of the inductance value and vice-side winding of the primary side winding calculated in step 2, transformation is calculated
The primary circuit impedance and secondary circuit impedance of device winding；Wherein, the primary circuit impedance X1=2 π fL1 of Transformer Winding, become
The secondary circuit impedance X2=2 π fL12/n2 of depressor winding, f=50Hz；
Step 4：Four sampled points are chosen, by data acquisition and analysis process system, computer goes out each sampled point and exists respectively
The primary circuit resistance value and secondary circuit resistance value of synchronization, calculates the mean value of four primary circuit resistance values, will meter
Real-time primary circuit resistance value of the mean value of the four primary circuit resistance values for obtaining as Transformer Winding, calculates four
The mean value of secondary circuit resistance value, using the mean value of calculated four secondary circuit resistance values as Transformer Winding
Real-time secondary circuit resistance value；
Step 5：Real-time primary circuit resistance value in step 4 and the primary circuit resistance value of standard are contrasted, and will be real
When secondary circuit resistance value contrasted with the secondary circuit resistance value of standard, judge whether Transformer Winding deforms.
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Cited By (2)
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| CN111487486A (en) * | 2020-03-06 | 2020-08-04 | 深圳供电局有限公司 | Distribution transformer on-line monitoring method and device, computer equipment and storage medium |
| CN111722152A (en) * | 2020-06-29 | 2020-09-29 | 龚小娟 | Transformer winding deformation monitoring method and monitoring system |
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